Browse Prior Art Database

Optical Disk ECC Threshold Control

IP.com Disclosure Number: IPCOM000060789D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Dewlen, GE: AUTHOR [+5]

Abstract

The adapter of an optical disk drive can be controlled from the host computer to change the threshold of errors past which the adapter's error correcting code (ECC) logic will indicate a permanent disk error and not attempt to correct the data field or its ID field. The adapter is shown in the figure. Elements of the adapter are the channel interface and control 10, the sector buffer 12, ECC check and syndrome generation 14, and data separator 16. Micro- controller 18 supervises the adapter. It interprets commands from the host and controls ECC logic 14, channel interface 10 and the drive interface 20. Micro-controller 18 also sends error and status messages to the host. Drive/receive logic 19 is used to adapt the channel interface to different host computers.

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Optical Disk ECC Threshold Control

The adapter of an optical disk drive can be controlled from the host computer to change the threshold of errors past which the adapter's error correcting code (ECC) logic will indicate a permanent disk error and not attempt to correct the data field or its ID field. The adapter is shown in the figure. Elements of the adapter are the channel interface and control 10, the sector buffer 12, ECC check and syndrome generation 14, and data separator 16. Micro- controller 18 supervises the adapter. It interprets commands from the host and controls ECC logic 14, channel interface 10 and the drive interface 20. Micro-controller 18 also sends error and status messages to the host. Drive/receive logic 19 is used to adapt the channel interface to different host computers. Data flow in a disk write operation is from the host through channel interface 10 and into sector buffer 12. While the data is in buffer 12, the ECC is generated and added to the data. The data and ECC are encoded into a run-length code and serialized by the channel interface and control 10. The coded data is then passed through the data separator to drive interface 20. A write command from controller 18 causes the optical drive (not shown) to write the data on the optical disk (not shown). Data flow in a read operation is from the optical drive through drive interface 20 to data separator 16. Separator 16 is a read channel function that separates data and clock information. The serial data is passed to channel interface 10, where it is decoded from the run length code and de-se...